Possible quantum risk mitigation steps - In order Step 1 - Create a new quantum resistant spend type Step 2 - If quantum resistance spends are popular, after a long grace period, consider banning new spends to quantum vulnerable addresses Step 3 - Implement quantum safe recovery system using BIP 39 seed phrase hash commitments, with spends in a two step transaction process Step 4 - After a very long grace period, consider banning quantum vulnerable spends (freezing coins)